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<h2><b>sin</b></h2><p> 

<code>sin(<i>expr</i>)</code><p> 

Takes the sin of the provided expression. It is assumed the expression is
in radiians. Result values are in the range -1 to 1. This function works
on both gridded and station data.

<H3>Usage Notes</H3><P>
<H3>Examples</H3><P>
